Removed extension attribute requirement for testing

tests/Unit/ExitCodes.Tests.ps1

@@ -142,6 +142,68 @@ Describe 'Exit codes produced by the run loop' {
     }
 }
 
+Describe 'Target attribute unavailable - dev tenants without an app registration' {
+
+    BeforeAll {
+        $script:unavailableError = "Response status code does not indicate success: 400 (Bad Request): Could not find a property named '$($script:target)' on type 'microsoft.graph.user'."
+    }
+
+    BeforeEach {
+        Mock Write-Host { }
+        Mock Write-Verbose { }
+        Mock Write-Warning { }
+    }
+
+    It 'continues in What-If mode, treating the attribute as null, when it is not registered' {
+        Mock Get-PersonaUsers {
+            param($SelectProperties, $UserObjectId, $PageSize)
+            if ($SelectProperties -ccontains $script:target) { throw $script:unavailableError }
+            @(New-TestPopulation -Count 5 -TargetAttribute $script:target)
+        }
+
+        $outcome = Invoke-PersonaEngineRun -Configuration (New-TestRuntimeConfiguration -TargetAttribute $script:target) `
+            -TargetAttribute $script:target -Context (New-TestAuditContext) -IsEnforcing:$false
+
+        $outcome.ExitCode | Should -Be 0
+        $outcome.Counters.Processed | Should -Be 5
+        Should -Invoke Get-PersonaUsers -Times 2 -Exactly
+        Should -Invoke Write-Warning -Times 1 -Exactly
+    }
+
+    It 'requests everything except the target attribute on the retry' {
+        Mock Get-PersonaUsers {
+            param($SelectProperties, $UserObjectId, $PageSize)
+            if ($SelectProperties -ccontains $script:target) { throw $script:unavailableError }
+            @(New-TestPopulation -Count 5 -TargetAttribute $script:target)
+        }
+
+        $null = Invoke-PersonaEngineRun -Configuration (New-TestRuntimeConfiguration -TargetAttribute $script:target) `
+            -TargetAttribute $script:target -Context (New-TestAuditContext) -IsEnforcing:$false
+
+        Should -Invoke Get-PersonaUsers -Times 1 -Exactly -ParameterFilter { $SelectProperties -cnotcontains $script:target }
+    }
+
+    It 'still fails enumeration in enforcement mode - the fallback never applies to a real write run' {
+        Mock Get-PersonaUsers { throw $script:unavailableError }
+
+        $outcome = Invoke-PersonaEngineRun -Configuration (New-TestRuntimeConfiguration -TargetAttribute $script:target) `
+            -TargetAttribute $script:target -Context (New-TestAuditContext -Mode 'Enforce') -IsEnforcing
+
+        $outcome.ExitCode | Should -Be 3
+        Should -Invoke Get-PersonaUsers -Times 1 -Exactly
+    }
+
+    It 'does not swallow an unrelated enumeration failure even in What-If mode' {
+        Mock Get-PersonaUsers { throw 'Graph request failed after 5 attempt(s) (last status: 503): service unavailable' }
+
+        $outcome = Invoke-PersonaEngineRun -Configuration (New-TestRuntimeConfiguration -TargetAttribute $script:target) `
+            -TargetAttribute $script:target -Context (New-TestAuditContext) -IsEnforcing:$false
+
+        $outcome.ExitCode | Should -Be 3
+        Should -Invoke Get-PersonaUsers -Times 1 -Exactly
+    }
+}
+
 Describe 'Exit codes owned by the entry script' {
 
     BeforeAll {